diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/runtime/mheap.go | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/src/runtime/mheap.go b/src/runtime/mheap.go index 893587e5d2..bf41125764 100644 --- a/src/runtime/mheap.go +++ b/src/runtime/mheap.go @@ -56,6 +56,12 @@ type mheap struct { // Internal pages map to an arbitrary span. // For pages that have never been allocated, spans entries are nil. // + // Modifications are protected by mheap.lock. Reads can be + // performed without locking, but ONLY from indexes that are + // known to contain in-use or stack spans. This means there + // must not be a safe-point between establishing that an + // address is live and looking it up in the spans array. + // // This is backed by a reserved region of the address space so // it can grow without moving. The memory up to len(spans) is // mapped. cap(spans) indicates the total reserved memory. |